bacteria + archaea Flashcards
what kind of bonds does archaea have?
ether bonds
what kind of bonds do bacteria have?
esther bonds
which one shares features with eukaryotes?
archaea
domain archaea have what kind of lipids
unique membranes
how many phyla do bacteria have?
roughly 50
which bacteria or archaea prefers moderate conditions?
bacteria
do archaea prefer moderate or harsh conditions?
harsh conditions
metabolic features of bacteria are only….
half understood
extremophiles
can only survive in harsh conditions
horizontal gene transfer
movement of one gene to another to increase diversity
cyanobacteria display the most….
diversity
what are cyano bacteria necessary in?
prodution of organic carbon and nitrogen and oxygen fixing
how many prokaryotic genes have been involved in horizontal gene transfer?
80%
what are the similar characteristics of bacteria and archaea
small size, rapid growth, and simple cell structure
what is the thykaloid?
ingrowths of plasma membranes
what does the thykaloid do?
increase surface area for photosynthesis
magnetosomes
magnetic crystals that can locate low oxygen habitats
cellular structures can do
all sorts of things, like adjust buyoancy
cocci
sphere
rods
bacilli
comma
vibrios
spiral flexible
spirochetes
spiral rigid
spirilli
slimy muciliage
secreted from cells
what is the slimy muciliage also called?
the cell wall
what are the functions of the slimy muciliage
helps evade and hold the colony together
cell walls are usually
rigid because it helps maintain shape and defense
most archaea use what for cell walls
peptides
most bacteria use what for their cell walls
carbs, usually (they can use peptides)
Gram negative:
less peptidoglycan, lose purple strain, resists penicillin
gram positive
relatively thicker layer, has purple stain, vulnerable to penicillin
Motility:
allows cells to move to favorable conditions by following chemical signals
Flagella
swimming outward motor, cells can have mutiple in different locations
Pilli
Twitch/glide, threadlike structures on cells, used for reproduction
Binary Fission is
asexual
conjugation is
sexial
autotrophs
produce their own organic compounds
heterotrophs
organisms that need to eat for organic compounds
Obligate aerobes
need oxygen
obligate anerobes
can’t tolerate oxygen
aerotolerant anaerobes
don’t use oxygen but not poisoned by it
facualtive aerobes
can use both
Carbon Cycle:
autotrophs synthesize organic compounds and then are eaten as food
Symbiosis
an organism that lives in close association with organisms
pathogen
parasitic microbe that causes disease symptoms